some members of scotland yards say police accepted bribes from reporters. >> an organization of 50,000 people and we've always said from time, some day they'll -- >> reporter: with the investigation widening daily here in the uk, some are wondering if the scandal will spread to murdoch's media holdings in the u.s. >> we need to find out, affirmatively, look into whether or not american citizens had their phones hacked into by any murdoch journalists. >> reporter: for now the only evidence is here in britain but proving to be enough to tarnish the image of a worldwide media empire. stephanie goss, nbc news, london. >>> in afghanistan tonight a lot of unanswered questions about the shocking assassination of president hamid karzai's half-brother. shot in cold blood at his home by a trusted associate. we have the story from kabul. >> reporter: hi, ann. ahmed wali karzai, he was lured out of a meeting and shot in cold blood. he was shot and killed by other security guards. he used the trust to lure him out of a meeting and shoot him in cold blood. he was also shot and killed by other securi